Steam-turbine.



UNITED STATES Patented May 23, 1905.

PATENT OEEICE.

ERAL ELECTRIC COMPANY, A CORPORATION OE NET YORK.

STEAM-TURBINE.

SPECIFICATION forming part of Letters Patent No. 790,407, dated May 23, 1905.

Application filed September 8, 1903. Serial No. 172,237.

To n.17/ 1071.077? 'it 'mf/LIU conc/27%:

Be it known that I, JOHANN STUMPE, a subject of the King of Prussiarerman Emperor, and a resident of Q7 Rankestrasse, Charlottenburg, near Berlin, Kingdom of Prussia, Grermany, have invented certain new and useful Improvements in Steam or Gas Turbines, of which the following is an exact specification.

My invention relates to improvements in steam or gas turbines, and more especially to turbines with several turbine-wheels or systems of turbine-wheels, one of which is supplied with fresh steam, while the second one is fed with the exhaust-steam of the first one, and so on, the second turbine-wheel rotating in a direction opposite to the direction in which the first one rotates.

The purpose of the invention consists in providing' an arrangement by means of which it is attained that the useful effect of the turbine-wheels rotating in one direction is equal to the useful effect of the turbine-wheels rotating in the opposite direction.

In driving dynamo-machines, ventilators, centrifugal pumps, or similar machines it is very often necessary to have two machines which must be driven simultaneously and which can alternately be coupled in parallel or in series. For driving such machines steam or gas turbines with two turbine-wheels or two systems of turbine-wheels rotating in opposite directions are advantageously used. The advantage of such turbines consists in this case in the driving fluid of the first turbine-wheel being easily fed either directly or by means of guide-blades to the second turbine-wheel and in the energy of the driving fluid being very advantageously utilized. Furthermore, a great advantage of such turbines over turbines with single tu rbine-wheels consists in the number of revolutions being considerably reduced, as will be clear when considering that in case both turbine-wheels have the same number of revolutions this number of revolutions amounts only to fifty per cent. of the number of revolutions in case only one turbine-wheel is provided.

If by means of a turbine with turbinewheels running in opposite directions two dynamo-machines, centrifugal pumps, or'the like machines which shall have the same effect shall be driven, it is a great disadvantage that the turbine-wheels have not the same useful effect-that is to say, that the primary turbine-wheel-z'. c., the turbine-wheel fed with fresh steam-has about two-thirds and the secondary turbine-wheelf. e., the turbine-wheel fed with the exhaust-steam of the first one--has only one-third of the total energy of the turbine. In order to do away with this disadvantage, I provide my new invention,which consists in utilizing the energy of the driving fluid in two turbines, each having turbine-wheels rotating' in opposite directions, which turbines are connected to each other, so that the primary wheel of one turbine is coupled with the secondary wheel of the second one and the secondary wheel of the first turbine is coupled with the primary wheel of the second turbine. It will be clear that by these means both systems of turbinewheels coupled to each other will have the same useful effect.

In order to make the invention more clear, I refer to the accompanying drawing, which shows a scheme of my new arrangement.

In the drawing, I) is a hollow shaft upon which two turbine-wheels c and c"l are fixed.

a is a shaft situated within the hollow shaft b. To the shaft c two turbine-wheels d' d are fixed. The turbine-wheels d d, as well as the turbine-wheels Z2 c2, form a special turbine. The turbine d c is fed by the nozzles c', and the turbine Z2 ci is fed by the nozzles c2. It will be seen from the drawing that d and ci are primary wheels and Z2 c' are secondary wheels. The primary wheel LZ of one turbine is connected by the shaft a to the secondary wheel Z2 of the second turbine, and the secondary wheel c of the first turbine is connected by the hollow shaft Z) to the primary wheel c2 of the second turbine. f is the rotating part of a dynamo-machine driven by means of the hollow shaft and f is the rotating part of a dynamo-machine driven by means of the solid or central shaft a. It will be clear that both dynamo-machines will have the same useful effect.

It will be understood that the drawing shows only an example which may be modified in different directions, it being perfectly immaterial in which manner the turbinewheels d Z2 and c c2 are coupled to each other.

. It is also immaterial whether the two turbines c d and 02 Z2 are both fed with fresh steam or whether one of these turbines is fed with the exhaust-steam of the first one. Instead of arranging turbines with two turbine-wheels turgines with several turbine-wheels may be use Having thus fully described the nature of this invention, what I desire to secure by Letters Patent of the United States isl. In a steam-turbine, the combination of two separate turbines, each having two turbine-wheels running in opposite directions, the primary wheel of one turbine being coupled with the secondary wheel of the second turbine, and the secondary wheel of the first turbine being coupled'with the primary wheel of the second turbine, substantially as described and for the purpose set forth.

2. In a steam-turbine, the combination of two separate turbines, each having two systems of turbine-wheels running in opposite directions, the primary turbine-Wheel system of one turbine being coupled with the secondary turbine-wheel system of the second JOHANN STUMPF.

Witnesses:

HENRY HAsPER, WOLDEMAR HAUPT. 

